Is the Federal Reserve encouraging a stock market bubble? Critics say a recent change to the central bank's policy framework has undesirable side effects and puts the dollar at risk. Fed member Lael Brainard admitted this week that the new policy, and consequent expectations that interest rates will stay lower for longer, could indeed entice investors to take more risk in the search for higher returns. In this podcast, ING's Chris Turner looks at what this means for financial markets around the world.